Photoactivation of dichloro(ethylenediamine)platinum(II) |
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Authors: | H Christopher Fry Cynthia Deal Erin Barr Scott D Cummings |
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Institution: | Department of Chemistry, Kenyon College, Gambier, OH 43022-9623, USA |
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Abstract: | Photolysis of dimethylsulfoxide (dmso) solutions of the compound Pt(en)Cl2, where en=ethylene-1,2-diamine, leads to solvolysis of the complex and formation of Pt(en)(dmso)Cl+. The reaction follows clean pseudo-first-order kinetics with parallel photolytically activated and thermally activated paths. Both paths are first-order in both Pt(en)Cl2 and solvent. Eyring analysis of the rate constants for 25 °C≤T≤55 °C yielded a Gibbs energy of activation of 96 kJ mol?1 for the thermal pathway and no measurable activation barrier for the photochemical pathway. The quantum yield for the photochemical path is 0.22, as determined using ferrioxalate actinometry. |
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Keywords: | Platinum Cisplatin Photodissociation Kinetics |
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